Tombaugh used the machine to look at photographs of the patch of the sky taken a few days apart. Night after night he patiently exposed the large glass plates. Day after day he had blinked the plates back and forth looking for anything different from the fixed points of starlight. Tombaugh still recalled just how uncomfortable and challenging the search for Planet X turned out to be. Tombaugh said, "you get cold getting up to I persevere, so this gets a brutally monotonous blinking back and forward."
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By studying the motion of that dim and distant dot of light astronomers discovered a Pluto year.
The time it takes to move around the sun was equal to 248 earth years. The angle of its orbit was steeper than any other planet. Its distance from the sun also varied more than any other planet. For 48 years that was all, anyone knew about Pluto.
In 1978, astronomers Jim Christie and Bob Harington analyzed new plates taken at US Naval Observatory in Flagstaff. Christie noted an elongation of the planet to the north. One month later, the bump had disappeared. Blink the images back and forward just like Clyde Tombaugh did and we see the bump is moving there. The conclusion is that the Pluto, like Earth, has a moon.
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